How do I make myself an administrator on a Windows 8.1 tablet without original administrator password?

I inherited a Windows 8.1 Home edition convertible tablet from someone and have set up my own user account, but need that account to have administrator access to install some VPN software for testing.  When I try to change my account type, the User Account Control window appears, asking me to enter the password for the original owner's user account.  I do not have this password and have been unable to obtain it (I can't blame the original owner for not wanting to give it out).  How can I take ownership of this tablet without that original password?
Michael BentfeldAssistant Network AdministratorAsked:
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JohnBusiness Consultant (Owner)Commented:
If this is now your computer, you need the prior owner to give you the password. They can then change their password.

Alternatively, had the tablet back the prior owner and ask them to change the admin password to something you know. Then proceed.

The administrator account is disabled and should remain so. You need the password above, set yourself as administrator and once done, delete the owners profile.
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JohnBusiness Consultant (Owner)Commented:
@mbrayc  - Thank you and I was happy to help.
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